Cationic anti-collapse agent for water-based drilling fluid, preparation method and application thereof

A technology of water-based drilling fluid and cation, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor wettability inversion effect, poor hydration of shale surface, poor compatibility of drilling fluid, etc., and achieve excellent Inhibit the anti-slump performance, maintain the stability of the borehole wall, and reduce the effect of negative charge

Active Publication Date: 2022-01-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the deficiencies in the prior art, especially in view of the existing water-based drilling fluid cationic anti-slump agents generally have poor compatibility with drilling fluids, poor wettability reversal effect and poor inhibition of shale surface hydration, the present invention provides A cationic anti-slump agent for water-based drilling fluid and its preparation method and application

Method used

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  • Cationic anti-collapse agent for water-based drilling fluid, preparation method and application thereof
  • Cationic anti-collapse agent for water-based drilling fluid, preparation method and application thereof
  • Cationic anti-collapse agent for water-based drilling fluid, preparation method and application thereof

Examples

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Embodiment 1

[0028] A cationic anti-slump agent for water-based drilling fluid, comprising the following raw materials in parts by mass: 6 parts of acrylamide, 1.5 parts of cationic monomer, 1 part of hydrophobic monomer, 0.5 part of modified silicon dioxide, 0.1 part of initiator, 40 parts of ethanol;

[0029] Wherein, the cationic monomer is dimethyl diallyl ammonium chloride; the hydrophobic monomer is dioctyl maleate; and the initiator is ammonium persulfate.

[0030] The modified silicon dioxide is prepared according to the following method:

[0031] Add nano-silica with a particle size of 20nm into ethanol, and disperse evenly by ultrasonic, then add silane coupling agent KH570, and react at 80°C for 8 hours; after the reaction is completed, filter with suction, wash with deionized water for 3 times, and dry , to obtain modified silicon dioxide; the mass ratio of ethanol to nanometer silicon dioxide is 20:1, and the mass ratio of the silane coupling agent KH570 to nanometer silicon ...

Embodiment 2

[0035] A cationic anti-slump agent for water-based drilling fluid is as described in Example 1, and its preparation method is as described in Example 1, except that the reaction temperature is 65°C.

Embodiment 3

[0037] A cationic anti-slump agent for water-based drilling fluid is as described in Example 1, and its preparation method is as described in Example 1, except that the reaction temperature is 75°C.

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Abstract

The invention provides a cationic anti-collapse agent for water-based drilling fluid, a preparation method and application of the cationic anti-collapse agent. The cationic anti-collapse agent is prepared from the following raw materials by mass: 6-10 parts of acrylamide, 1.5-2.5 parts of a cationic monomer, 1-2 parts of a hydrophobic monomer, 0.3-0.5 part of modified silicon dioxide, 0.1-0.3 part of an initiator and 30-50 parts of ethanol. The invention also provides a preparation method of the cationic anti-collapse agent. The cationic anti-collapse agent for the water-based drilling fluid has the advantages that the inhibition performance is high, the shale rolling recovery rate is high, the surface wettability of shale can be reversed from liquid wettability to strong hydrophobicity, and hydration expansion of shale clay minerals is effectively inhibited.

Description

technical field [0001] The invention relates to a cationic anti-slump agent for water-based drilling fluid, a preparation method and application thereof, and belongs to the field of oilfield chemistry in the petroleum industry. Background technique [0002] Shale gas is an important growth point for increasing oil and gas reserves and production in my country. Shale formations have strong heterogeneity, prominent anisotropy, and high content of clay minerals. During shale gas drilling, under the influence of the shale's own force and drilling fluid, the relationship between clay, minerals, and water in the shale well wall Adverse reactions are formed during this period, which leads to hydration and expansion of clay minerals, and the strength of rock near the wellbore wall decreases, which in turn leads to downhole complex situations such as wellbore instability and drill sticking. At present, oil-based drilling fluid with good inhibitory properties is generally used for dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C08F220/56C08F220/34C08F226/02C08F220/18C08F222/14
CPCC08F220/56C09K8/03C09K2208/10C09K2208/12C08F220/34C08F226/02C08F220/1804C08F220/1812C08F222/14
Inventor 吕开河刘佳金家锋孙金声黄贤斌王金堂白英睿刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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